Displaying 20 results from an estimated 10000 matches similar to: "adding 1 month to a date"
2004 Aug 27
1
Plotting irregular grid as image or persp
Hi,
I have an array of 2d node locations and an array triangles, and would
like to plot something like a image or persp.
An example of doing it with rgl is:
library(ncdf)
library(rgl)
# wget http://www.maplepark.com/~drf5n/extras/teapot.nc
teapot<-open.ncdf("teapot.nc")
z<-get.var.ncdf(teapot,"tris")
l<-get.var.ncdf(teapot,"locations")
2007 May 04
1
Partitioning a kde2d into equal probability areas
Hi,
I'd like to partition a 2d probability density function into regions of
equal probability. It is straightforward in the 1d case, like
qnorm(seq(0,1,length=5)) but for 2d I'd need more constraints.
Any suggestions for how to approach this? Is seems like a spatial
sampling problem but I'm not sure where to look.
Thanks for your time,
Dave
--
Dr. David Forrest
drf at
2005 Jun 06
9
R Graph Gallery : categorization of the graphs
Hello all,
It seems that the next improvement to the R Graph Gallery is
categorization of the graphics, that way each graph will be easier to
find. That step should be done *carefully* if we want to avoid the
opposite side-effect : graph not reachable through the categories.
That's why the wisdom of the R community is required.
Graphics will be classified in :
- categories
-
2003 Jul 11
3
postscript/eps label clipping
The following code produces an eps file with the tops of each of the ylabs
clipped off.
par(mfrow=c(2,2))
plot(runif(10),
ylab="Function(Lengthy Expression)",xlab="Prediction")
plot(runif(10),
ylab=expression(Delta * Beta^2),xlab="Prediction")
plot(runif(10),
ylab="Function(Lengthy Expression)",xlab="Prediction")
2004 Dec 08
2
what about a mascot ?
My friend Veslot proposed me the Raven !
http://www.teteamodeler.com/allopass/images/corbeau.jpg
As a matter of fact the intelligence of this bird is
comparable to one of a monkey, although its brain is close to
a reptile brain. R is quite the same : small, compact, but so
clever.
This is a canadian website explaining (in french) the R-aven
intelligence
2007 Mar 12
3
reading BMP into R
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2007 Mar 27
1
Using nnet
I have a problem when using nnet to predict the negative values. For example
:
X = matrix(c(1,1,0,0,1,0,1,0),4,2)
X
Y = matrix(c(0,1,1,0)) - 0.5 # XOR - 0.5
Y
nn = nnet(X,Y,size=3)
val = predict(nn,X)
val # this is expected to be close to Y, but it's not !
The 'val' is always positive. I tried to change the options, but the result
isn't much better.
Could someone give me an
2005 Apr 01
2
(no answer)
I wish to perform brain surgery this afternoon at 4pm and don't know
where to start. My background is the history of great statistician
sports legends but I am willing to learn. I know there are courses and
numerous books on brain surgery but I don't have the time for those.
Please direct me to the appropriate HowTos, and be on standby for
solving any problem I may encounter while
2007 Apr 24
5
Random Number Generator of Park and Miller
Hi,
I failed to search for R package providing random number generator of "Park
and Miller".
Anyone know any R package supporting this kind of function?
Thanks,
Grace
--
View this message in context: http://www.nabble.com/Random-Number-Generator-of-Park-and-Miller-tf3636501.html#a10154554
Sent from the R help mailing list archive at Nabble.com.
2004 Dec 09
3
US 2004 Elections map
even for people who didn't like the outcome of the US elections this
year, it must have been a joy to see all the nice (and not so nice)
graphs that were shown. As an exercise, I recreated the map shown on
the NY-Times website [
http://www.nytimes.com/packages/khtml/2004/11/03/politics/
20041103_px_ELECT_GRAPHIC.html ]
If you're interested,
2005 Mar 22
1
sub('^','var',1:3) produces unexpected results
Hi,
According to help(sub), the ^ should match the zero-length string at the
beginning of a string:
sub('^','var',1:3) # "1" "2" "3"
sub('$','var',1:3) # "1var" "2var" "3var"
# This generates what I expected from the first case:
sub('^.','var',11:13) # "var1" "var2"
2005 Nov 09
8
Element-by-element multiplication operator?
Is there an element-by-element multiplication in R, like the .* operator in Matlab?
eg: A (2x3)
B (2x3)
C=A.*B
C (2x3)
C = [[a11*b11 a12*b12 a13*b13]; [a21*b21 a22*b22 a23*b23]]
I can't find one...
Thanks
-Mike Gates
2004 Nov 19
5
help! a urgent question
Dear Sir/Madam,
I am doing a project related to R.
However, it is always difficult find some R functions.
The R user guide seems not complete.
Is there any free document about all R functions ?
Who knows ? please help me.
My email is myzhaogong@yahoo.com
Thank you very much
---------------------------------
[[alternative HTML version deleted]]
2005 Aug 24
8
Call SAS from R
Hi All,
I am new to post question on this list. I apologize if this question is too
easy or irrelevant.
I am doing a simulation study and I need to read a data file that can be
easily read by SAS.
So, what I try to do is to execute SAS in R and then read the output of SAS
to R.
I try the following code but it didn't work.
system("c:\\program files\\sas institute\\v8\\sas.exe
2006 Sep 18
8
acos(0.5) == pi/3 FALSE
Hello,
I don't know if the result of
acos(0.5) == pi/3
is a bug or not. It looks strange to me.
Inaki Murillo
2006 Jul 28
4
add one month or one year to a date
Hi,
I need to be able to add one month or in some cases on eyear to a Date.
Does anyone know of any easy ways of doing this?
thanks
scott
--
Posted via http://www.ruby-forum.com/.
2007 Apr 11
8
graphs superimposed on pictures?
Hi:
I am doing some work that involves plotting points of interest
superimposed on photographs and maps. I can produce the plots fine in R, but so far
I have had to do the superimposition externally, which makes it tedious to do exploratory work.
I have looked to see if there is some capability to put a background picture on a plot window,
but I have not found anything.
Advice, anyone?
Cheers
2005 Mar 23
2
sub('^', .....) bugs (PR#7742)
>>>>> "David" == David Forrest <drf5n@maplepark.com>
>>>>> on Tue, 22 Mar 2005 15:02:20 -0600 (CST) writes:
David> According to help(sub), the ^ should match the
David> zero-length string at the beginning of a string:
yes, indeed.
David> sub('^','var',1:3) # "1" "2" "3"
2009 Sep 11
1
format (?) problems with data imported from postgres
Good day,
I read some data from a PostgreSQL database by a following script:
library(Rdbi)
library(RdbiPgSQL)
# conn becomes an object which contains the DB connection:
conn <- dbConnect(PgSQL(), host="localhost", dbname="BVS",
user="postgres", password = "*******")
query_duj_kal <- dbSendQuery(conn, "select zdroj as well, cas as date,
fe2,
2010 Nov 24
3
Custom ticks on x axis when dates are involved
Hi,
I have a set of irregular time series and i want to produce a simple plot, with dates on x axis and attribute value of y axis. This is simple enough but my x axis is divided automatically by ticks every 5 years. I would like to have a tick every year at January 1st. I am not sure how i can do that - i end up with something very close to what i want, but it is clunky and not very correct. I